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    <title>Document</title>
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<style>
    h3 {
        text-align: center;
    }
    
    a {
        margin-bottom: 5px;
        display: block;
        text-align: center;
        color: #ccc;
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    <div class="container">
        <div class="row">
            <div class="col-lg-3 col-lg-push-9 col-md-4 col-md-push-8 col-sm-6 col-sm-push-6 col-xs-12">
                <div class="thumbnail">
                    <img src="img/bootstrap.png" alt="...">
                    <div class="caption">
                        <h3>1优站精选</h3>
                        <a href="#">Bootstrap 网站实例</a>
                        <p>Bootstrap 优站精选频道收集了众多基于 Bootstrap 构建、设计精美的、有创意的网站。</p>
                    </div>
                </div>
            </div>
            <div class="col-lg-3 col-lg-push-3 col-md-4 col-md-push-0 col-sm-6 col-sm-pull-6 col-xs-12">
                <div class="thumbnail">
                    <img src="img/bootstrap.png" alt="...">
                    <div class="caption">
                        <h3>2优站精选</h3>
                        <a href="#">Bootstrap 网站实例</a>
                        <p>Bootstrap 优站精选频道收集了众多基于 Bootstrap 构建、设计精美的、有创意的网站。</p>
                    </div>
                </div>
            </div>
            <div class="col-lg-3 col-lg-pull-3 col-md-4 col-md-pull-8 col-sm-6 col-xs-12">
                <div class="thumbnail">
                    <img src="img/bootstrap.png" alt="...">
                    <div class="caption">
                        <h3>3优站精选</h3>
                        <a href="#">Bootstrap 网站实例</a>
                        <p>Bootstrap 优站精选频道收集了众多基于 Bootstrap 构建、设计精美的、有创意的网站。</p>
                    </div>
                </div>
            </div>
            <div class="col-lg-3 col-lg-pull-9 col-md-4 col-sm-6 col-xs-12">
                <div class="thumbnail">
                    <img src="img/bootstrap.png" alt="...">
                    <div class="caption">
                        <h3>4优站精选</h3>
                        <a href="#">Bootstrap 网站实例</a>
                        <p>Bootstrap 优站精选频道收集了众多基于 Bootstrap 构建、设计精美的、有创意的网站。</p>
                    </div>
                </div>
            </div>
        </div>
    </div>



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